SB2023102554 - Denial of service in Junos OS PFE

Security Bulletin ID SB2023102554

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Remote access

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Improper handling of inconsistent special elements (CVE-ID: CVE-2023-36843)

CWE-ID: -

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of inconsistent special elements error in the Junos Services Framework (jsf) module when handling malformed SSL traffic. A remote non-authenticated attacker can cause a crash in the Packet Forwarding Engine (pfe).

This issue only affects devices with Juniper Networks Advanced Threat Prevention (ATP) Cloud enabled with Encrypted Traffic Insights (configured via security-metadata-streaming policy).

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2023-10-Security-Bulletin-Junos-OS-SRX-Series-The-PFE-will-crash-on-receiving-malformed-SSL-traffic-when-ATP-is-enabled-CVE-2023-36843